Betrayal of a bff?

i don't understand. ok there was this one guy that i liked and i used to say, "wow! he's really cute and he can sing too." ever since then, she's been rubbing all up over him and leaves me in the center of the lunchroom to go and start feeling up on him and making ual noises like it's cute and i feel so embarred for people to see me with her, probably thinking i act like that(all whorish and stuff, no offense) and does the same thing to all her "girl" friends that she sees and it puts a bad impression on me. now there's this guy that likes us both, but likes me more and today, he saw me walking in the lunchroom and stopped right in front of me and just waited there, then my friend looked at me and literally pushed me out of the way and said to him“are u in the military?” and started conversating with himand bragged about it afterwards and kept saying, “I knew it!” and keeps staring at him now. Is she a bad friend?